After he and his brother-in-law, Roman Kroitor, created documentaries for Expo 67 in Montreal that used multiple screens and projectors, they decided to invent a single large-format projector. By the mid-1970s, they had established the technology and made and shown a few highly praised nature documentaries, but it took many years to overcome producer and exhibitor skepticism and get IMAX accepted as the popular spectacular it ultimately became — and Ferguson was the top creative mind behind the company that whole time. – The New York Times
